关键词: 微型桩, 多排, 等效刚度, 承载力校核, 计算方法

Abstract: As a small and light weight retention structure, the micropile has been widely used in the slope reinforcement engineering for its convenient in the construction, small disturbance to slope and large lateral stiffness. Due to the complex structure, of the multi-row anti slide micropiles, a unified analytical theory has not been formed, and its load carrying capacity is even more complicated. Based on the equivalent stiffness replacement method, the multi-row micropiles are equivalent to the single row micropiles. An improved evaluation process of the load carrying capacity of the multi-row micropiles is proposed in this paper. On the basis of ensuring the accuracy of the evaluation results, the proposed evaluation method greatly reduces the analytical procedures and associated complexity and has advantages of simple operation and the strong adaptability. Combined with the widely used practical steel pipe pile applications, the verification method of strengthening shallow landslide in alluvium soils with multi-rows of micropiles is also proposed in the paper, which provides a reference for the analysis and the application of micropiles in the shallow landslide mitigations.